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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Chester Water Authority

Monochloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

128

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
20182.27 ppb3223ND - 4.60 ppb
20191.26 ppb9640ND - 4.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date Lab ID Result
2018-09-072337327003ND
2018-09-0723373270022.20 ppb
2018-09-0723373270013.20 ppb
2018-09-072337327005ND
2018-09-0723373270062.20 ppb
2018-09-072337327008ND
2018-09-0723373270072.00 ppb
2018-09-072337327004ND
2018-10-102343959003ND
2018-10-1023439590023.40 ppb
2018-10-1023439590012.70 ppb
2018-10-1023439590052.20 ppb
2018-10-1023439590062.70 ppb
2018-10-1023439590082.80 ppb
2018-10-1023439590072.80 ppb
2018-10-1023439590042.60 ppb
2018-11-0723493570032.70 ppb
2018-11-072349357002ND
2018-11-0723493570012.60 ppb
2018-11-0723493570064.60 ppb
2018-11-0723493570084.30 ppb
2018-11-072349357007ND
2018-11-072349357004ND
2018-11-082349357005ND
2018-12-1130055080033.90 ppb
2018-12-1130055080023.60 ppb
2018-12-1130055080013.80 ppb
2018-12-1130055080053.20 ppb
2018-12-1130055080063.70 ppb
2018-12-1130055080083.70 ppb
2018-12-1130055080074.20 ppb
2018-12-1130055080043.60 ppb
2019-01-0830098950034.50 ppb
2019-01-0830098950024.10 ppb
2019-01-0830098950013.50 ppb
2019-01-0830098950053.70 ppb
2019-01-0830098950063.60 ppb
2019-01-0830098950083.60 ppb
2019-01-0830098950073.60 ppb
2019-01-0830098950043.70 ppb
2019-02-1230168010034.80 ppb
2019-02-1230168010023.30 ppb
2019-02-1230168010013.60 ppb
2019-02-1230168010053.30 ppb
2019-02-1230168010062.80 ppb
2019-02-1230168010083.00 ppb
2019-02-1230168010072.80 ppb
2019-02-1230168010043.40 ppb
2019-03-073020744003ND
2019-03-073020744002ND
2019-03-073020744001ND
2019-03-073020744005ND
2019-03-073020744006ND
2019-03-073020744008ND
2019-03-073020744007ND
2019-03-073020744004ND
2019-04-103027870003ND
2019-04-103027870002ND
2019-04-103027870001ND
2019-04-103027870005ND
2019-04-1030278700062.30 ppb
2019-04-1030278700082.70 ppb
2019-04-1030278700072.30 ppb
2019-04-103027870004ND
2019-05-163034622003ND
2019-05-163034622002ND
2019-05-163034622001ND
2019-05-163034622005ND
2019-05-163034622006ND
2019-05-163034622008ND
2019-05-163034622007ND
2019-05-163034622004ND
2019-06-073038500003ND
2019-06-073038500002ND
2019-06-073038500001ND
2019-06-073038500005ND
2019-06-073038500006ND
2019-06-073038500008ND
2019-06-073038500007ND
2019-06-073038500004ND
2019-07-093044794003ND
2019-07-093044794002ND
2019-07-093044794001ND
2019-07-093044794005ND
2019-07-093044794006ND
2019-07-093044794008ND
2019-07-093044794007ND
2019-07-093044794004ND
2019-08-073050926003ND
2019-08-073050926002ND
2019-08-073050926001ND
2019-08-073050926005ND
2019-08-073050926007ND
2019-08-073050926006ND
2019-08-073050926004ND
2019-08-123051528001ND
2019-09-1130576070032.00 ppb
2019-09-1130576070022.20 ppb
2019-09-113057607001ND
2019-09-1130576070052.20 ppb
2019-09-1130576070062.30 ppb
2019-09-113057607008ND
2019-09-1130576070072.10 ppb
2019-09-1130576070042.10 ppb
2019-10-0830630420033.30 ppb
2019-10-0830630420023.60 ppb
2019-10-0830630420012.90 ppb
2019-10-0830630420053.30 ppb
2019-10-0830630420063.10 ppb
2019-10-0830630420083.10 ppb
2019-10-0830630420073.40 ppb
2019-10-083063042004ND
2019-11-0730689940032.60 ppb
2019-11-0730689940023.00 ppb
2019-11-0730689940012.40 ppb
2019-11-0730689940052.10 ppb
2019-11-0730689940062.80 ppb
2019-11-0730689940082.20 ppb
2019-11-0730689940072.80 ppb
2019-11-0730689940042.40 ppb
2019-12-103075060003ND
2019-12-103075060002ND
2019-12-103075060001ND
2019-12-103075060005ND
2019-12-103075060007ND
2019-12-103075060006ND
2019-12-103075060004ND
2019-12-113075164001ND